Matrix clock



FIG. 1 is a top, front, and left side perspective view of a matrix clock showing our new design;

FIG. 2 is a front elevation of FIG. 1;

FIG. 3 is a front elevation of FIG. 1 without a specific time shown in bold letters on the clock face;

FIG. 4. is a top, front and left side perspective view of a second embodiment of the matrix clock; and,

FIG. 5 is a left side elevation of the second embodiment. 

CLAIM The ornamental design for a matrix clock, as shown and described. 